Shelter Island is a high performance solvent-base antifouling formula that uses a high end technology of Zinc Pyrithione and Zinc Oxide. Shelter Island provides multi-season antifouling protection against barnacles, algae, and hydroids in salt and freshwater on boat bottoms only. Its ablative copolymer base renders a smooth finish with durability and abrasion resistance. Shelter Island releases biocide during the constant exposure of new paint film to the water. Shelter Island has universal application over all types of properly prepared bottom paints. For use on fast fiberglass boats, wood, steel, and aluminum hulls.